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Any update on a Trailer TPMS system?

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i'll be down in town tomorrow, I'll send it to you
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MountainViews1234

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Installed the ML3T-13A576-AKF cord today--Thanks David. The sensors work just fine. I'll be enabling the aux camera/TPMS in forscan soon and checking to see if my camera works on my trailer. The pinout on the main fat cable was the same as the previous plus a bunch more pins. The 12 pin also had the right amount of wires.

Although I know this wasn't the cord that was recommended the one I needed has been sold out for months. My truck was built April 2021. 21 F150 3.5L eco boost Lariat 502A with max tow. This cord came with an extra pig tail labeled 33482-6227 22232 10. I think it might be for later trucks with the tongue scales? Anyone have an idea what this connector might be? Should I tape it up to protect from water?

Ford F-150 Any update on a Trailer TPMS system? IMG_1233


Ford F-150 Any update on a Trailer TPMS system? IMG_1234
 
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When I had my tire shop install the sensors in my trailer tires the steel stems wouldn't seal in with my rims. They pulled the steel stems off the sensors and replaced with rubber, all good now. Display shows pressure and temperature.
 

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When I had my tire shop install the sensors in my trailer tires the steel stems wouldn't seal in with my rims. They pulled the steel stems off the sensors and replaced with rubber, all good now. Display shows pressure and temperature.
Interesting, glad you / they found a solution.

Just curious, are your trailer wheels steel or aluminum alloy?
 
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Interesting, glad you / they found a solution.

Just curious, are your trailer wheels steel or aluminum alloy?
Mine are aluminum alloy, came from the factory with these wheels. A bit fancier than the the standard trailer wheel. The steel stems on the sensors ford shipped me didn't have much rubber to make a seal with, so it didn't surprise me when they leaked. I'm okay with rubber stems, though, since max psi on my tires is 80lbs.
 

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MountainViews1234

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When I had my tire shop install the sensors in my trailer tires the steel stems wouldn't seal in with my rims. They pulled the steel stems off the sensors and replaced with rubber, all good now. Display shows pressure and temperature.
I can confirm ML3T-13A576-AKF (old part number ML3Z-13A576-PB) worked for my 2021 F150 Lariat 502A with Max Tow which I thought I only could use ML3Z-13A576-PK (old part number ML3Z-13A576-TFA). Thanks again GoldenGateCanyon! Now to get my tires stems installed.
 

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Update - Turns out that ML3T-13A576-AKF is a new number for ML3Z-13A576-PB, the two parts are identical. And, it turns out that my 2023 Lariat DID have 9 wires to the 12 pin connector, shipped that way from the factory, but for some reason Ford installed the 7/4 connector instead of the desired 7/12 ... I've replaced the 7/4 connector with the 7/12 and plugged the cable/camera/TPMS repeater from LC3Z-1A189-A into it. All good. Camera works and the truck wants to program the TPMS. That work will remain for another day. Now I've got a spare, never used ML3T-13A576-AKF wire harness looking for a new truck. Any takers? I'll box it up and ship it if you VENMO me the cost of shipping.
Might be a stupid question but how were you able to tell you had 9 wires to the 12 pin connector? I have 23 and I’m curious if mine might already have the proper harness too.
 
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Might be a stupid question but how were you able to tell you had 9 wires to the 12 pin connector? I have 23 and I’m curious if mine might already have the proper harness too.
Well ... when I dropped the spare tire, I was able to see all the wiring, and it became apparent that they had tucked the 12 pin connector into a plug cover on the wire harness. And that 12 pin connector had 9 wires running to it. Weird, I thought, that they installed the 7/4 pin on the bumper, instead of the 12 pin ... If your 2023 has the 7/4 pin, drop the spare and look for the 12 pin, you may be in luck!
 

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Well ... when I dropped the spare tire, I was able to see all the wiring, and it became apparent that they had tucked the 12 pin connector into a plug cover on the wire harness. And that 12 pin connector had 9 wires running to it. Weird, I thought, that they installed the 7/4 pin on the bumper, instead of the 12 pin ... If your 2023 has the 7/4 pin, drop the spare and look for the 12 pin, you may be in luck!
Sweet I will have to take a look today!
 
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To those of you who have gotten this working, did you have to do any FORScan stuff to get the truck to see the sensors? Or was it just plug and play?

I am assuming that I can just install the correct harness, plug in the TPMS repeater and the truck should see the sensors.

I have a YAW sensor today and do not want the camera, so I will be buying the TPMS w/trailer back assist support.
 

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Sweet I will have to take a look today!
Perhaps of interest / help, see the pics at this post. You're looking to count the wires on "C439" which should be 'stowed' in a 'blind cap' immediately behind the bumper.

Good luck!

I am assuming that I can just install the correct harness, plug in the TPMS repeater and the truck should see the sensors.
Using steering wheel buttons scroll through your IPC display looking for
  1. Towing >
  2. Trailer Tire Info >
  3. "Trailer with tire pressure monitor capability not detected"
If you've got that you're set insofar as the module programming for trailer TPMS support; if not, you're not.

Good luck!
 

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Perhaps of interest / help, see the pics at this post. You're looking to count the wires on "C439" which should be 'stowed' in a 'blind cap' immediately behind the bumper.

Good luck!


Using steering wheel buttons scroll through your IPC display looking for
  1. Towing >
  2. Trailer Tire Info >
  3. "Trailer with tire pressure monitor capability not detected"
If you've got that you're set insofar as the module programming for trailer TPMS support; if not, you're not.

Good luck!
This is even better. Pictures are my best friend. Thanks
 

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This is even better. Pictures are my best friend. Thanks
From my archive, here's a pic of the 'fully populated' (9 wires, 3 unused pins) C439 by another forum member. In this view C439 is plugged into the '12-pin' bumper socket.
Ford F-150 Any update on a Trailer TPMS system? FULLY POPULATED 12-PIN CONNECTOR
 
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Emmittfan22

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From my archive, here's a pic of the 'fully populated' (9 wires, 3 unused pins) C439 by another forum member. In this view C439 is plugged into the '12-pin' bumper socket.
FULLY POPULATED 12-PIN CONNECTOR.jpg
So after crawling under my truck I do have the C439 with 9 wires plugged into a blind cap. So I do not need the new wiring harness correct???
 

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So after crawling under my truck I do have the C439 with 9 wires plugged into a blind cap.
You should be good-to-go with the plug-and-play Ford Accessory Trailer TPMS / Cam kit.

The kit I bought on 6/13/2022 (PN LC3Z1A189A) included the 7+12 pin connector to replace the OE 7+4 pin connector in my bumper. My 'fully-populated 9-wire C439' plugged into the back of that. Everything for the trailer was included. installed it all and Eureka, trailer TPMS with tire temperature and trailer rear cam view all worked as advertised.
_______________

Then, I added further mods to locate the 7+12 pin connector in my truck bed for my 5th wheel RV, leaving the OE 7+4 pin connector in my bumper.

I'm still Loving the setup a year+ later, couldn't be happier with it! (y) :)
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